Weird display with merged rows and filtered columns

Submitted by boulshet @boulshet

Link to original bug (#796338)

Description

Created attachment 372335 Minimal datasheet to repdoduce the issue

i have some little issue with a large spreadsheet that i managed to reproduce in a minimal datasheet : when filtering a table with merged rows, under some circumstances, the test of a cell is displayed twice. Please have a look at the attachments, it will be more easy. I am running gnumeric 1.12.41 on mageia cauldron (development) uptodate Thanks

Attachment 372335, "Minimal datasheet to repdoduce the issue":
gnumeric.gnumeric

Version: 1.12.x